An employer is liable for a tort committed by Bob, its employee, in which of the following situations?

a)

Bob was on duty, stopped off at a bar, consumed two drinks, and struck a pedestrian while driving to his next company appointment.

b)

Bob was on duty, a coworker cussed at him, and Bob punched the coworker in the face, breaking his nose.

c)

Bob was on duty and struck a pedestrian who stepped off the curb while he was driving to his first appointment of the day.

d)

Bob was sailing with clients and one of the clients was swept overboard by an unexpected wave and nearly drowned.